The group focus is closing the datepicker it seems. How about placing the datepicker in a popup inside the RE? (I am sure this is not ideal … just a suggestion)
In order to achieve your goal, we would like to suggest you use “Floating Group” instead of the group focus.
We’ve tried to create a similar use case with a floating group and it works as expected. Here is a video showing the setup needed for this: Loom | Free Screen & Video Recording Software
As you can see from the video, we’ve added a group (x) that is transparent then set the workflow for when that transparent group is clicked to hide the floating group. So, when you click outside of the floating group, it will be closed automatically. However, if you would like to hide the floating group when you click add button, you can simply add the “hide floating group” action to the “when button add clicked” event.